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CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Operating revenues        
Electric $ 3,176 $ 2,941 $ 8,643 $ 7,430
Natural gas 268 219 1,364 1,082
Other 23 22 69 67
Total operating revenues 3,467 3,182 10,076 8,579
Operating expenses        
Electric fuel and purchased power 1,210 981 3,643 2,611
Cost of natural gas sold and transported 86 54 603 425
Cost of sales — other 11 11 28 28
Operating and maintenance expenses 568 579 1,752 1,708
Conservation and demand side management expenses 78 73 222 215
Depreciation and amortization 537 513 1,586 1,449
Taxes, Other 152 158 472 453
Total operating expenses 2,642 2,369 8,306 6,889
Operating income 825 813 1,770 1,690
Other (expense) income, net (3) 1 5 (6)
Earnings from equity method investments 13 12 47 29
Allowance for funds used during construction — equity 21 30 53 91
Interest charges and financing costs        
Interest charges — includes other financing costs of $7, $7, $22 and $21, respectively 211 221 628 628
Allowance for funds used during construction — debt (7) (11) (18) (33)
Total interest charges and financing costs 204 210 610 595
Income before income taxes 652 646 1,265 1,209
Income tax expense (benefit) 43 43 (17) 24
Net income $ 609 $ 603 $ 1,282 $ 1,185
Weighted average common shares outstanding:        
Basic (in shares) 539 526 539 526
Diluted (in shares) 539 528 539 527
Earnings per average common share:        
Basic (in dollars per share) $ 1.13 $ 1.15 $ 2.38 $ 2.25
Diluted (in dollars per share) $ 1.13 $ 1.14 $ 2.38 $ 2.25